Spray apparatus



Aug. 15, 1939. G. H. BUZZARD ErAL' SPRAY APPARATUS Filed Sept. l 1937 2 Sheets-Sheet 1 60/6 H. 5033mm Ham/0%. [Fade/407d SAW 4.

Aug. 15, 1939. G. H. BVUZZARD r AL S PRAY APPARATUS Filed Sept 1, 1937 2 Sheets-Sheet 2 Elmo rm i a/e H. 51/ aro Hara/d A fine/um! snow/"441,0,

Patented Aug. 15, 1939 SPRAY APPARATUS Gale H. Buzzard and Harold A. Roselund, Toledo, Ohio, assignors to The De Vilbiss Company,

.Toledo, Ohio, a corporation 01. Ohio Application September 1, 1937, Serial No. 161,928

7 Claims.

This invention relates to apparatus for the spraying of surface coating materials, and particularly to such apparatus adapted for the spraying of varnish, clear lacquers and other finishing 5 materials free of pigments directly from containers in which the material is shipped.

The object of the invention is the provision of various features of improvement, whereby to enhance the practicability and commercial value of apparatus of this character.

The invention is fully described in the following specification, and one embodiment thereof illustrated inthe accompanying drawings, in

which- Figure 1 is a side elevation of an apparatus embodying the invention operatively mounted on a shipping container, with parts broken away; Fig.

2 is a top plan view thereof, with parts broken away; Fig. 3 is an enlarged fragmentary end view of the pump end of the apparatus, with parts broken away; Fig. 4 is an enlarged sectional view on the line 4-4 in Fig. 2, with parts in full, and Fig. 5 is an enlarged section on the line 5-5 in Fig. 3, with parts in,full and parts broken away.

Referring to the drawings, l designates a container of the drum type in which the material to be sprayed is shipped. Such containers usual- 1y have flat ends which are countersunk relative to the side walls to form at each end a chime 2 which is usually shouldered at its outer side. The top end of the container is provided with a bung hole bushing 3,

The apparatus embodying the invention includes a base plate 5 adapted to be mounted on the top chime of the container at one side of the bushing 3 and is of a length to 'extend across the top of the container. The plate is provided on its under side adjacent to its ends with an inner set of depending lugs 6 for outward abutment against the inner wall of the chime and also with an outer set of lugs I disposed at the outer side of the chime and each carrying a set screw 8 for engagement under the .chime bead or shoulder and to cooperate with the lugs 6 to clamp the plate in position on the container. The spacing between the lugsli and 1 of each cooperating pair is suflicient' to permit the mounting of the base plate on containers of varying diameter.

Mounted on the plate near. one end is a pump housing In containing a suitable pump mechanism preferably of the rotary type, one form of which is illustrated at H in Fig. 3. The pump chamber has an inlet passage l2 and an outlet I passage I3. A motor I5 is mounted on the opposite end of the plate 5 and has its shaft, in the present instance, connected to the pump shaft l6.

An insert unit 20, which forms a part of the apparatus, but is separate from or movable relativeito the base plate 5, is adapted to be inserted into the container through the bung hole bushing 3 and includes spaced telescoped inner and outer pipes 2| and 22 connected at their upper.

or inner ends to a header 23, with the inner pipe connected to an outlet 24 and the outer pipe connected to an inlet 25 of the header. The outer or free end of the inner pipe 2| extends through the outer end of the pipe 22 and is shown as notched or serrated; at its end to permit material to flow therein from the container when the pipe end is resting on the container bottom. The pipe 22 preferably extends to near the lower end of the pipe 2| and has communication with the interior of the container preferably through side openings 26 at such end. A collar. 21 is adjustably mounted on the pipe 22 and is adapted to enter the bushing 3 and to have shouldered engagement with its outer edge to close the bushing opening and to serve as a stop for limiting the extent of movement of the insert 20 into the container.

The outlet 24 of the insert header is connected by a flexible hose 28 to the pump inlet passage I2 through an intermediate connection 29 having an inclined side opening in which a removable filter screen 30 is mounted. This screen is preferably of tubular form with its inner end open and carried at its outer end by a plug 3| threaded into said side opening. The filter 39 extends into {the main passage of the connection 29 in such manner that the material passes first through the open inner end of the filter and then through its side wall before passing to the pump. In this manner, all the sediment or dirt in the material is within the filter and may be easily cleaned therefrom by removing the filter from the connection. It is thus apparent that the pump is supplied by material from the container through the pipe 2|, header outlet 24, flexible hose 28, connection 29 and filter 30.

Mounted on the pump housing ID in connection I manual'shutofi valve 40. The gunside of the discharge passage is in communication with a pressure gauge 4|, so as to indicate the material pressure therein. The material in its return to the containeri's discharged from the lateral openings 26 in the tube 22, thus tending to agitate the material in the container. supplied to the spray gun 39 through the flexible tube 50, which leads from any suitable source of supply, as well understood in the art.

The discharge passage 36 has a by-pass or lateral discharge passage 42, which is connected through a pressure relief valve 43 and flexible hose 44 to the inlet 25 of the insert header 23.

The relief valve is usually set fora relief pressure of about 35 lbs., the adjustment being made at the factory, and does not require further adjustment during the ordinary running of the apparatus. The regulator 31 -is set by the operator to have a discharge pressure to the gun usually from 3 to 22 lbs., depending on the requirements of the material used and the work being performed. It is thus apparent that when the apparatus is being operated and the pressure in the discharge line at the pump side of the pressure regulator 31 is higher than that for which the relief valve 43 is set, the excess material in such portion of the line is returned to the container I through the return tubes 44 and 22. The relief valve is of the type having a manual release for quickly opening the line for flushing purposes.

It is found important for the efiicient andeconomical operation of an apparatus of this class that the pump side of the material supply line be separated from the material supply tube 38 of the gun and from the return passage to the container by separate pressure regulators, so that the pressure at which the material-is returned to the container is controlled by one regulator and the pressure at which the material is supplied to the gun is controlled by another regulator. It is also important to make provision for opening the relief valve 43, so that all of the material discharged by the pump may be freely returned to the container so as to flush out the return line,

which flushing action is rendered more effective by closing the material discharge passage either at the gun or between it and the pressure regulator31. By making the suction passage from the container to the pump entirely separate from the material return passage, it is possible to maintain a return circulation of material to the container at the same time the material is drawn fromthe container to the pump, it being only "necessary for such double action that the material pressure at the discharge side of-the pump be greater than the relief pressure for which the valve 43 is set. It is found that by maintaining such continual operation of the pump and consequ nt flow of a portion of the material back tofrom the spirit of the claims.

Having thus described our invention, What we claim as new, and desire to secure by Unite States Letters Patent, isz' r 1. In an apparatus of the class described, a

Air under pressure is pump, a suction tube for insertion into a liquid container and having communication with the pump inlet, means forming a material discharge passage from the pump outlet, said suction tube including a rigid part through which the suction passage extends and having a lateral inclined openinginto said passage, and means closing the outlet end of said opening and having a tubular filter member projecting across the suction passage with its end opened to one side of the pas- "sage, whereby material in its flow throughthe suction passage passes through said open end of the filter'member and then through its filtering sidewall. i

2. A portable dispensing apparatus for directlydispensing material from containers having a top provided with an opening and a flanged chime, including a base having spaced dependent lugs for engagement with the inner side of the flanged chime, means carried by the base and cooperating with the lugs to bring the latter into gun, conduit connected to the pump outlet, a bypass conduit connecting said last named conduit with the return nozzle, and a normally closed pressure operated valve in the by-pass conduit -adapted to open so as to permit the materialto flow back to the container through the return fnozzle adjacent the inlet opening of the suction nozzle for agitating the material in the container when the flow of material through the spray gun conduit is prevented.

3. A portable dispensing apparatus in accordance with claim 2, in which the normally closed pressure operated valve in the by-pass conduit is.

constructed and arranged so as to provide for manual opening thereof independent of the ma-v terial pressure in the spray gun conduit whereby to flush the by-pass conduit and the return nozzle.

4. A portable dispensing apparatus including a base, having a pair of spaced lugs depending from its lower face, an adjustable member'carried by the base adjacent each of the lugs and cooperating with the latter for securing the base to a material container having a closed .tOD provided with an opening to dispensethe container contents, a pump mounted on'said base having an inletand an. outlet, a motor mounted on said base and in driving connection with said pump,

a suctiontube lnsertible through saidopening .in

the container top, and connected to the pump inlet, spray gun dispensing conduit connected to the pump outlet, and a material pressure regulating valve disposed between the pump outlet and spray gun dispensing conduit.

5. A portable spray gun apparatus for use. I

the base member, a motor on the base member fordriving the pump, said pump having an outlet for connection with a spray gun, and having an inlet, an ambulant conduit connecting the said pump inlet to-the suction tube whereby to provide for alinement of the tube with, and for insertion in, the said opening of the container top, and means to removably connect the base member to a material container, whereby same and the aforesaid elements carried thereby may be removed and applied to a new container.

6. A portable spray gun apparatus as set forth in claim 5, wherein said means or the suction tube is arranged to engage the container top to restrict downward movement of the tube when inserted in the container opening to a predetermined extent, and wherein the conduit connecting the pump inlet to the suction tube consists of a flexible hose.

7. A portable spray gun apparatus for use with containers having a top provided with an openthe latter, a suction tube separate from the base and insertible through the opening and having means in connection therewith to engage the container top so as to overlie the opening, a pump on the base having an inlet, a motor on the base for driving the pump, and a conduit connecting the pump inlet to the suction tube so as to allow the tube to be inserted in the opening of the container top and the base engaged with the container top, said pump having an outlet for connection with a spray gun conduit.

GALE H. BUZZARD.

HAROLD A. ROBELUND. 

